141 lines
2.7 KiB
JavaScript
141 lines
2.7 KiB
JavaScript
/*!
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* invitem.js - inv item object for bcoin
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* Copyright (c) 2014-2015, Fedor Indutny (MIT License)
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* Copyright (c) 2014-2016, Christopher Jeffrey (MIT License).
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* https://github.com/bcoin-org/bcoin
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*/
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'use strict';
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var constants = require('../protocol/constants');
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var BufferWriter = require('../utils/writer');
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var BufferReader = require('../utils/reader');
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/**
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* Inv Item
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* @param {Number} type
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* @param {Hash} hash
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* @property {InvType} type
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* @property {Hash} hash
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*/
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function InvItem(type, hash) {
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if (!(this instanceof InvItem))
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return new InvItem(type, hash);
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this.type = type;
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this.hash = hash;
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}
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/**
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* Write inv item to buffer writer.
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* @param {BufferWriter} bw
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*/
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InvItem.prototype.toWriter = function toWriter(bw) {
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bw.writeU32(this.type);
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bw.writeHash(this.hash);
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return bw;
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};
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/**
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* Serialize inv item.
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* @returns {Buffer}
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*/
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InvItem.prototype.toRaw = function toRaw() {
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return this.toWriter(new BufferWriter()).render();
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};
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/**
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* Inject properties from buffer reader.
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* @private
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* @param {BufferReader} br
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*/
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InvItem.prototype.fromReader = function fromReader(br) {
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this.type = br.readU32();
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this.hash = br.readHash('hex');
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return this;
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};
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/**
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* Inject properties from serialized data.
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* @param {Buffer} data
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*/
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InvItem.prototype.fromRaw = function fromRaw(data) {
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return this.fromReader(new BufferReader(data));
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};
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/**
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* Instantiate inv item from buffer reader.
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* @param {BufferReader} br
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* @returns {InvItem}
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*/
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InvItem.fromReader = function fromReader(br) {
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return new InvItem().fromReader(br);
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};
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/**
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* Instantiate inv item from serialized data.
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* @param {Buffer} data
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* @param {String?} enc
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* @returns {InvItem}
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*/
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InvItem.fromRaw = function fromRaw(data, enc) {
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if (typeof data === 'string')
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data = new Buffer(data, enc);
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return new InvItem().fromRaw(data);
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};
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/**
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* Test whether the inv item is a block.
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* @returns {Boolean}
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*/
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InvItem.prototype.isBlock = function isBlock() {
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switch (this.type) {
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case constants.inv.BLOCK:
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case constants.inv.WITNESS_BLOCK:
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case constants.inv.FILTERED_BLOCK:
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case constants.inv.WITNESS_FILTERED_BLOCK:
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case constants.inv.CMPCT_BLOCK:
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return true;
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default:
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return false;
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}
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};
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/**
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* Test whether the inv item is a tx.
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* @returns {Boolean}
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*/
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InvItem.prototype.isTX = function isTX() {
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switch (this.type) {
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case constants.inv.TX:
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case constants.inv.WITNESS_TX:
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return true;
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default:
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return false;
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}
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};
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/**
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* Test whether the inv item has the witness bit set.
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* @returns {Boolean}
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*/
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InvItem.prototype.hasWitness = function hasWitness() {
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return (this.type & constants.WITNESS_MASK) !== 0;
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};
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/*
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* Expose
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*/
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module.exports = InvItem;
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